Ignore Camera and Flip bits in CVO when parsing video rotation

webrtc/modules/rtp_rtcp/include/rtp_cvo.h

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #ifndef WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_CVO_H_
@@ skipping 16 matching lines @@
       return 1;
     case kVideoRotation_180:
       return 2;
     case kVideoRotation_270:
       return 3;
   }
   RTC_NOTREACHED();
   return 0;
 }
 
-inline VideoRotation ConvertCVOByteToVideoRotation(uint8_t rotation) {
-  switch (rotation) {
+inline VideoRotation ConvertCVOByteToVideoRotation(uint8_t cvo_byte) {
+  // CVO byte: |0 0 0 0 C F R R|.
+  const uint8_t rotation_bits = cvo_byte & 0x3;
+  switch (rotation_bits) {
     case 0:
       return kVideoRotation_0;
     case 1:
       return kVideoRotation_90;
     case 2:
       return kVideoRotation_180;
     case 3:
       return kVideoRotation_270;
     default:
       RTC_NOTREACHED();
       return kVideoRotation_0;
   }
 }
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_CVO_H_